1 #include <stdio.h> 2 3 extern int a(int); 4 extern int b(int); main(int argc,char const * argv[])5 int main (int argc, char const *argv[]) 6 { 7 printf ("a(1) returns %d\n", a(1)); 8 printf ("b(2) returns %d\n", b(2)); 9 } 10